A Split Ring Array Antenna for WLAN Applications Using MIMO Techniques
The paper proposes design of an array antenna with proximity coupled feeding at frequency 2.55 GHz. At first, a linearly polarized rectangular patch antenna is discussed. The basic rectangular structure is modified using proximity coupled feed to enhance the impedance bandwidth. Then, in order to introduce circular polarization, the patch structure is further modified into split ring structure. An array of these split rings is constructed to increase the directivity. Inter-element spacing of the array is further changed with 5mm offset and it is observed that the antenna turns in to a dual band antenna. The performance of Split Ring Array Antenna (SRAA) is investigated in terms of relevant parameters viz. impedance bandwidth, gain, axial ratio and efficiency.